Liquid fuel



Patented Feb. 10, 1925.

UNITED. STATES PETER FBIESENHAHN, OF BERLIN-HALENSEE, GERMANY.

LIQUID FUEL.

No Drawing.

To all whom it may concern:

Be it known that I, PETER FRIESENHAHN, .a citizen of Germany, residing at Hubertusallee 41, Berlin-Halensee, Germany, have invented certain new and useful Improvements in Liquid Fuel, of which the following is a specification.

The present invention refers to a liquid fuel for explosion motors, especially for the purposes of motor cars, ships, etc.

The new liquid fuel consists of a mixture of hydrogenated naphthalenes with ali' phatic hydrocarbons of low boiling points Such aliphatic hydrocarbons having boiling points below 150 degrees centigrade. Some of the intermixed aliphatic hydrocarbons may boil below 100 degrees centigrade.

Suitable hydrogenated naphthalenes for my purpose are especially tetrahydronaphthalene, having a specific gravity of about 0.976 which completely distills between 205- 210 degrees centigrade, and dekahydronaphthalene, which has a specific gravity of about- 0.900, and completely distills at about 190 degrees centigrade.

Of the aliphatic hydrocarbons I choose those which have a favorable effect on the specific gravity, the boiling points and the inflammation point of the mixture. I have found especially suitable a mixture of 60 per cent tetrahydronaphthalene and 10 per cent aliphatic hydrocarbons boiling less than 100 degrees centigrade, of an aliphatic hydrocarbon having a boiling point below 150 degrees centigrade.

Suitable mixtures are for instance (1) 50 parts by weight tetrahydronaphthalene, 50 parts by weight so called light motor benzine of specific gravity 0.725, (2) 50 parts by weight tetrahydronaphthalene, 40 parts by weight of heavy benzine of specific gravity 0.760 and 10 parts by weight gasolene of specific gravity 0.650. The two mixtures have a specific gravity of about 0.850 and are a very suitable substitute for light benzine because of their low temperature of ignition. The exhaust gases are colourless and odorless. The said mixtures have lower velocity of explosion than that of unmixed benzine and do not ignite on compression,

I like pure benzine.

One may add to the mixtures according to the present inventionother liquid fuels, as benzol. A suitable liquid fuel may consist of parts by weight tetrahydronaphtha- Application filed July 1, 1922. Serial No. 572.302.

lene, 50 parts by weight motor benzine of speclfic gravity 0.725, 50 or 100 parts by weight motor benzol.

Other suitable mixtures according to the present invention contain ethyl alcohol (fuel alcohol, commercial alcohol, spirit). Mixtures of tetrahydronaphthalene, aliphatic hydrocarbons and ethyl alcohol do not produce soot and yield greater energy.

In order to avoid a separation of such mlxtures I prefer to use neutral aliphatic oxygen compounds containing hydrogen, oxy en and more than two carbon atoms. Suc compounds may be ethylic ether or aliphatic monohydric alcohols of a boiling point above 80 degrees centigrade as, for instance, amyl alcohol.

Allylalcohol, isopropylalcohol, cetylalcohol, methylallylcarbinol, cetylaleohol, cerylalcohol, myricylalcohol. All of these alcohols have the effect of increasing the stability of the mixture when water is added and the temperature is changed. The alcohols with higher proportion of carbon have the advantage that to increase the stability of the mixture, less amounts are required than with alcohols of lower carbon content. This is important with reference tothe efi'ect as fuel. One requires less amounts of allylalcohol than of ethylalcohol and by far less amounts of cetylalcohol than of ethylalcohol or allylalcohol. v I

A suitable mixture is 30 parts by weight tetrahydronaphthalene, 35 parts by weight light benzine, 30 parts by weight ethyl alcohol, 5parts by weight amyl alcohol. The proportions may be varied. The mixture preserves its clearness even at low tempera tures, as for instance at 10 degrees centigrade below zero.

In the place of tetrahydronaphthalene one may use dekahydronaphthalene or other hydrogenated derivatives of naphthalene or mixtures of them.

I claim:

1. Liquid fuel consisting of a mixture of hydrogenated naphthalenes and aliphatic hydrocarbons, some of said aliphatic hydrocarbons boiling below 150 degrees centigrade and some of said aliphatic hydrocarbons boiling below degrees centirade. g 2. Liquid fuel consisting of a mixture of tetrahydronaphthalene and aliphatic hydrocarbons, some of said aliphatic hydro- I carbons boiling below 150 degrees centigrade and some of said aliphatic hydrocarbions boiling below 100 degrees centigra e.

3. Liquid fuel consisting of a mixture of hydrogenated naphthalenes and aliphatic hydrocarbons, some of said aliphatic hydrocarbons boiling below 150 degrees centigrade, and some of said aliphatic hydrocarbons boiling below 100 degrees centigrade, said mixture containing ethyl alcohoL 4. Liquid fuel consisting of a mixture of tetrahydronaphthalene and aliphatic hydrocarbons, some of said aliphatic hydrocarbons boiling below 150 degrees centigradc,

and some of said aliphatic hydrocarbons boiling below 100 degrees centigrade, said mixture containing ethyl alcohol.

5. Liquid fuel consisting of a mixture of hydrogenated naphthalenes and of aliphatic hydrocarbons some of which'boilbelow 150 degrees Centigrade, and some of which boil below 100 degrees centigrade, said mixture containing ethyl alcohol and amylalcohol.

6. Liquld fuel consisting of tetrahydronaphthalene and of aliphatic hydrocarbons some of which boil below 150 degrees centigrade and some of which boil below 100 degrees centigrade, said mixture containing ethyl alcohol and amyl alcohol.

In testimony whereof I hereunto aflix my signature.

' PETERFRIESENHAHN. Witnesses:

; ELISABETH FRIESENHAHN',

RUDoLF KORNER. 

